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Effects of Humic and Fulvic Acids on Silver Nanoparticle Stability, Dissolution, and Toxicity.
Environ Sci Technol. 2015 Jul 07; 49(13):8078-86.ES

Abstract

The colloidal stability of silver nanoparticles (AgNPs) in natural aquatic environments influences their transport and environmental persistence, while their dissolution to Ag(+) influences their toxicity to organisms. Here, we characterize the colloidal stability, dissolution behavior, and toxicity of two industrially relevant classes of AgNPs (i.e., AgNPs stabilized by citrate or polyvinylpyrrolidone) after exposure to natural organic matter (NOM, i.e., Suwannee River Humic and Fulvic Acid Standards and Pony Lake Fulvic Acid Reference). We show that NOM interaction with the nanoparticle surface depends on (i) the NOM's chemical composition, where sulfur- and nitrogen-rich NOM more significantly increases colloidal stability, and (ii) the affinity of the capping agent for the AgNP surface, where nanoparticles with loosely bound capping agents are more effectively stabilized by NOM. Adsorption of NOM is shown to have little effect on AgNP dissolution under most experimental conditions, the exception being when the NOM is rich in sulfur and nitrogen. Similarly, the toxicity of AgNPs to a bacterial model (Shewanella oneidensis MR-1) decreases most significantly in the presence of sulfur- and nitrogen-rich NOM. Our data suggest that the rate of AgNP aggregation and dissolution in aquatic environments containing NOM will depend on the chemical composition of the NOM, and that the toxicity of AgNPs to aquatic microorganisms is controlled primarily by the extent of nanoparticle dissolution.

Authors+Show Affiliations

Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

26047330

Citation

Gunsolus, Ian L., et al. "Effects of Humic and Fulvic Acids On Silver Nanoparticle Stability, Dissolution, and Toxicity." Environmental Science & Technology, vol. 49, no. 13, 2015, pp. 8078-86.
Gunsolus IL, Mousavi MP, Hussein K, et al. Effects of Humic and Fulvic Acids on Silver Nanoparticle Stability, Dissolution, and Toxicity. Environ Sci Technol. 2015;49(13):8078-86.
Gunsolus, I. L., Mousavi, M. P., Hussein, K., Bühlmann, P., & Haynes, C. L. (2015). Effects of Humic and Fulvic Acids on Silver Nanoparticle Stability, Dissolution, and Toxicity. Environmental Science & Technology, 49(13), 8078-86. https://doi.org/10.1021/acs.est.5b01496
Gunsolus IL, et al. Effects of Humic and Fulvic Acids On Silver Nanoparticle Stability, Dissolution, and Toxicity. Environ Sci Technol. 2015 Jul 7;49(13):8078-86. PubMed PMID: 26047330.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of Humic and Fulvic Acids on Silver Nanoparticle Stability, Dissolution, and Toxicity. AU - Gunsolus,Ian L, AU - Mousavi,Maral P S, AU - Hussein,Kadir, AU - Bühlmann,Philippe, AU - Haynes,Christy L, Y1 - 2015/06/24/ PY - 2015/6/6/entrez PY - 2015/6/6/pubmed PY - 2016/4/23/medline SP - 8078 EP - 86 JF - Environmental science & technology JO - Environ Sci Technol VL - 49 IS - 13 N2 - The colloidal stability of silver nanoparticles (AgNPs) in natural aquatic environments influences their transport and environmental persistence, while their dissolution to Ag(+) influences their toxicity to organisms. Here, we characterize the colloidal stability, dissolution behavior, and toxicity of two industrially relevant classes of AgNPs (i.e., AgNPs stabilized by citrate or polyvinylpyrrolidone) after exposure to natural organic matter (NOM, i.e., Suwannee River Humic and Fulvic Acid Standards and Pony Lake Fulvic Acid Reference). We show that NOM interaction with the nanoparticle surface depends on (i) the NOM's chemical composition, where sulfur- and nitrogen-rich NOM more significantly increases colloidal stability, and (ii) the affinity of the capping agent for the AgNP surface, where nanoparticles with loosely bound capping agents are more effectively stabilized by NOM. Adsorption of NOM is shown to have little effect on AgNP dissolution under most experimental conditions, the exception being when the NOM is rich in sulfur and nitrogen. Similarly, the toxicity of AgNPs to a bacterial model (Shewanella oneidensis MR-1) decreases most significantly in the presence of sulfur- and nitrogen-rich NOM. Our data suggest that the rate of AgNP aggregation and dissolution in aquatic environments containing NOM will depend on the chemical composition of the NOM, and that the toxicity of AgNPs to aquatic microorganisms is controlled primarily by the extent of nanoparticle dissolution. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/26047330/Effects_of_Humic_and_Fulvic_Acids_on_Silver_Nanoparticle_Stability_Dissolution_and_Toxicity_ L2 - https://doi.org/10.1021/acs.est.5b01496 DB - PRIME DP - Unbound Medicine ER -